Rotary cutter



1 March 29, ALBEE 1,851,613

ROTARY CUTTER Filed Nov. 14, 1930 I Z Sheets-Sheet l March 29, 1932. H,ALBEE 1,851,613

ROTARY CUTTER Filed Nov. 14, 1930 2 Sheets-Sheet 2 Patented Ma. 29,1932.

UNITED STATES HUGH M. ALBEE, OF

ORANGE, MASSACHUSETTS, ASSIGNOR To THE IiEAVITT MAoHmri f COMPANY, OFORANGE, MASSACHUSETTS ROTARY CUTTER.

= Application filed Nvember 14,19 3( Serial ivb.4a5,775..

The invention relates to rotary cutters of the general type shown inPatent No. 1,227,- 514:, dated May 22, 1917 employed for dressing orrecutting valve seats and the principal objects of the instant inventionare to simplify the supporting and Operating means for the cuttercarrying disk, to provide a positive lockingmeans for securing thecutters to'the disks or to spacer blocks carried by the latter, and,generally stated; to provide a rotary cutter ofsimplified construetion,but materially increased efficiency and durability. The inventionis illustrated in the accompanying drawings, in which Fig.1 is a-frontelevation of the tool, the

pp r away. 7

.Fig/Q is a side'elevation. v Fig. 3 is a fragmentary view correspondinggenerally to that in Fig. '1, with the cutters arranged forpreliminarily scraping the valveseat. I Fig. 4 is a fragmentaryperspective showing one of the cuttersand the accessories for lockingthe same to the disk. i Fig. 5' is a fragmentary perspective showing themode of applying the. shims, when a the device is employed as a scraper.

portion of the handle being broken Fig. 6 is a fragmentary sectionalelevation showing the relation of one of the cutters and its securingmeans with respect to the disk.

Fig. 7 is a similar view showing the cutter arranged with, its scrapingedge in opera tive relation. y l i I Fig. 8 is a fragmentary sectionalelevation illustrating the mode of mounting the individual cutters onspacer blocks. 7 Fig.9 is a perspective view of one of the U spacerblocks. a

Referring to the drawings, lrindicates the rotary cutter head" in theform of a relatively-thin disk provided with agroove or chan- 'nel '2 inits peripheral edge, which channel extends throughout theentirecircumference of. the disk and is generally rectangular 1n crosssection. The center of the disk is pro-' vided with asocket 3 by meansof which the tool maybe supported inoperative relation,

on a suitable cutter bar, as explained inthe patent aforesaid and in theother patents therein referred to. Substantially encircling V theperipheral edge of the disk 1 and engagmg the groove or channel 2thereinis a strap or yoke 4, preferably formed of spring steel andhaving its inner peripheral surface fiattenedto snugly engagethe bottomof the r groove or channel 2. One end of the strap 4 isfixedinthebottomofa block 5 and on the bottom of the block adjacent the anchorageof the strap therein is a toe or fulcrum memher 6 having-an arcuatefacealso engaging V the bottom of the groove 2 in thedisk. Ex

tending laterally from theblock 5 are two parallel. shoulders .8 forminga clevis,' in which is pivoted, on a pin 9, the lower por tion of'alever 10' provided with anup'ward extension. 10f in vthe'form of anoperating rod or handle. The portionof the lever below thepivotpoint'isformed with an angularly dlsposed shoulder piece 10,which is perforatedto receive the otherend of thestrap 4 which strap end is adjustablylocked to the lever 10by aknurled nut engaging the threads on the end ofthe stran. Disposed between themember 10 of the lever-and the block 5 1Shelical spring13, which tends to move the portion of the lever above its'pivot point outwardly and correspondingly move the lower portion 10'ofthe said lever inwardly,

ereby causing the strap 4 to hug the bottom of the groove'or channel 2inthe periphery of theldiskwith considerable pressure. so

that. when the lever 10 is swung to the left.

as viewed in Fig.1, afterthe tool is adjusted for dressing or recuttinga valve seat the frictional engagement between the strap and the bottomof the peripheral groove 2 will give a partial rotation to the disk."Movement of the lever in the opposite direction, however, will causethe "lower end of'the lever to vrelease'thetension on the strap, so

that the latter will slide-around the periph-' eral groove and the diskwill remain stationary; In the swinging movement of the lever, r

which is effected manually; the toe 6 on the block?) serves as a fulcrumand also as a fric tion shoeassisting in impa rting'a rotary mo: j

tion tothe disk, when the lever ismovedin the direction to tighten thestrap about the v shims withdrawn andthe cutters replaced periphery ofthe' disk, as explained.

The cutters 21 are of the same generaltype as those employed in thedevice shown in the patent aforesaid, that is to say, each cutterconsists of a bar of steel in the form. ofa triangular prism havingthree coordinatecutting or dressing edges, or two straight cuttingedges, the third being providedwith teeth or serrations, whichpwhenapplied in operative position, will scrape'the valve. seat.

to remove any incrustations or foreign materials lodged thereon andwhich mayalsobe employed to take a rough cut fromthe valve seat, if thelatter is badly pitted or impaired. The cutter j bars are. provided oneach face with-a longitudinal groove 22, the

groove in one face engaging a spline 15 fixed in the groove 16 in thefaceof the disk '1 and another, of the grooves 221s adapted to beengaged by a. shoulder 19 formed onthe undercut side of a clamp. or dog18, which is a r adaptedfto be locked tothe plate in the relationshowninthe drawings by a screw bolt 20' passing through an opening in theclamp and engaging a threaded opening in the disk 17.

As indicated, each of the cutters is secured,

in a similar manner, to one face of the disk and is capable oflongitudinal adjustment to operate on valve seats of varying diametersand, inall positions of adjustment, each cutter bar will be firmlyclamped in position by the engagement of the spline 15 with one of thegrooves in the cuttera'nd the engagement of'the associated clamp 18 withanother of In Fig; 1, the cutters areqindicated as apthe cutter;grooves, namely, that'in the latera'l face of the cutter bar adjacentthe. clamp. r

plied for the purpose of dressing or recutting va valve seatwith-'the's'traight edges of each cutter lying. in a common; plane.which is.

.p'arallel to the surface of the disk 1. It will be Iunderstood,..ofcourse, that any of the edges of therespectiveucutters may beemployedin' operating on thevalve seat and,

when itfis desired to scrape the se'ator to i take a preliminaryroughcut therefrom,

' Under these circumstances, it is desirable to those cutters having oneedge provided with serrations are applied. and clamped to the face ofthedisk so that the serrated edges are directed outward or'toward the work.

elevate these serrated cutting edges above the plane of the straight orplain edges of the other cutters and this is effected by slippingrelatively thin shims 'between the face of the cutter adjacent-the disk,which shims straddle the splines "15, but leave enough ofthc latterprojecting above the top surface of the shims to engage 'the groove inthe bottom of the corresponding cutters,

" as more p, rticularly illustrated in Fig. 7.

After these serrated-cuttershave. done their work, they are releasedfrom the-clamps, the

with a straight or plain cuttingedge in op- 'erative relation, so thatall of the cutters will then be effective in dressing or imparting the,final cut to the valve seat.

Vhen the tool is employedto-operate upon valve seats that are associatedWithacentral- I 1y disposed projection, it will be necessary to: spacethe cutters from the disk at a sufii-. cient" distance to. bridge theprojection and still permit the rotary disk or cutter bar withwhich itis associated to be properly positioned within the .valve casing. To

effect this spacing of the cutters, spacer blocks are provided,corresponding i-n numher to the cutters, each block having av groove 32in its bottom to engage a spline 15 on the disk, and a rib or spline 33on its top, which is adapted to engage the longitudinal groove, in anycutter bar 21 which is mounted on said spacer blOCk,'iI1 the manner'shownin a screw of sufficient lengthto pass through the opening in the.clamp and a registering opening 31 in thespacerblock and to engage thethreaded opening 17 inthe disk 1, is applied in-thefmanner and formshown in Fig.. 8. It will be noted that, when the serrated edges of thecutters are to beemployed'and the cutters are mounted on the, spacerblocks 30, the shims 25 maybe applied between the bottomsof the serratedcutters and the upper faces of the spacer'blocks, each shim straddlingthe:rib.;33 on the corresponding spacer block, so that these serratededges" of the cutters will be raised slightly abovethe plane of thestraight or plain edges, of the other cutters. 7

WhatI claim is: V 1 1. A rotary cutter, comprising a disk, a -plu-'rality of cutters carried by one face thereof each comprising a bar oftriangular pris matic form provided with longitudinal grooves in itsfaces, and means for locking the individual cutters to the disk eachincluding' a spline carried by the disk to be engaged by one of thecutter grooves, a clamp having an undercut face to engage a lateral faceof the cutter, and a bolt for securing theclamp of each comprising atriangular prismatic bar provided with longitudinal grooves in itsfaces, andmeans for locking the individual cutters to the disk eachincludinga spline the cutter grooves, a clamp-having an undercarried-bythe disk to be engagedwith one of V face and groove of the cutter, and abolt for I securing the clamp to the disk.

3. A- rotary cutter, comprising a disk, a plurality of cutters adaptedto be adjustably mounted on one face of the disk each'comprising atriangular prismatic bar provided with longitudinal grooves in itsfaces, spacer blocks having ribs on their tops to engage the grooves inthe bottoms of cuttersmounted thereon and having grooves in theirbottoms, splines on the face of the disk engaging the grooves in thebottoms of the blocks, clamps having undercut faces for engaging thelateral faces of cutters on the spacer blocks, and screw bolts engagingregistering holes in the clamps, the blocks and the disk to lock thecutters to the blocks and the blocks to the disk.

In testimony whereof I affix my'signature. V

HUGH M. ALBEE.

